Secret system of telegraphy



Oct.l 420..l 1925. g

' n l..V M. PoTTs ,SECRET SYSTEM QF TELEGRAHY INV' TOR. u Mm @mi a ORNEY.

j. .'pasemed' oa. zo, 1925.

i ,Poaa'roiv or 'NEW YORK.

l f lOvtems.'

:vr An object of thefinventionlis to provide sv *anlarrangement whereby message .impulses will lbe n unintelligent .to unauthorized .per-.

rivate subscrbers :the use .of lthe 'different i. channels offa multiplexl andlalsoto use the differentl channels .of ajmultiplex for the .f ltelegraph "business of anumber of` smaller fcit'ies'. Especially in the casewhere the :mul-f 'y 25 l' rif l subscribers, it/Would be very undesirable for l yone subscribertovreceiveja message ,ori anypart of a message inten'dedfor another sub ff; fscrfiberl.v It is the usual practice todiyide- "i fthe segmentspn the distributing sunfiowerl vrdeWioe-of .asynchronous .multiplex into segments ofa group being, consecutive' and fl all arranged in the sameorder to represent evidentthat in :the i oase Yof vra vfour-channel multiplex there Will loeffour positions ofthe distributors in Whicho-negroup would match v up 4with a group at the .other end of ,the

line, so that in case the multiplex were used at Aone end. mightvv receive fthe" messages rom v -chronized distributorsarej used, it is toA loey V 'kunderstoiodthat the. method is also appli- 50V v-lcalole toxother telegraphi'c methods.

lapplication mea Marchfza 192e..seriaifnmgsevgsr vriB'e knownthatr I, Louis "'Pofrasfa f ,citizenof theiUnited "States fof America; yrey. f sidingk at Baltimora State 'of Maryland, "g5 'hayeiinvented certain 'new-and useflulf'lrm-z proyementsfin .SecretSystems :of vTeleg.

, itheimpulsesionthe branch'lnesi This y.invention relates; to, YVtelegraph vsys-A f v f 7 Connections s f Y f' fn Figure lk X andi YJ, repres'entygtwo It-ha's lloeennproposed to givea 'nuinloerfof` liXOftOWns, adjacent to a large `city,iso that eachi v*of/thetowns WillV haizezdirect ,communica-f i tion With a distant large city by 4the-fuseof* a` single trunklinebetweenithe tjWo largev t'iplex is .tohe used bya number of privatey Idescribedin.connection with a system` w the kWell `known =ve` uni-M9066, za-ltheug. "t 'is torbe understoodithat he methodf "liinitedtojanyparticular COde.;It= is l `in; multiplexing"to-sgroup the segnav tsa groups of equal numbersof segments,. the.

the Vdierent elements of 1the-cod'e. It isy forfour privatesubscribers,=any 'suloscriloe'rv vany vor" Athe"otlier subscribers ,at the 'other f end. of theline'. Thepresent invention ypro-f ffposes methods which obviatetheabovediif-Withthe correspondingegmento y culty." While the'Y invention isvhere described [group: 1 lAll-i the l other `segn1entsyW "with reference to a multiplex inpwhich syn?,

.or With n a v dilerent, nsegment ...of .ft-

f ,Logis Miomrspr BALT11v1oRE',MARYLAND, assieme, BY.mssnajasseignyfmj-"sgfff AMERICAN ,TELEBHONE AND lmiamiformriii CMPANY, or NEWNYE, Y.; lA/C diagramA- ,Figure iS(y viik st @Ordinato the-group ini :Figure andto 8.0. group'them all alike lsoxthat theZgroups C vand D Wouldfloe exactly `1ikegifoup It Will rloef-noted,Yhfowleyei", that inyFiguIe, 2; i each of the groups B,G and D arediierent I from` the group A and also yfrom ,one-,ani 85",.'y other,ioothv in theV ysequence .of theimpulse/s,"V l i and inrtheir arrangement. lfthere isfaf sendingcommutator'arranged,aocoiidingto ,e n Figure Q and` a .recvzeivin-gy;commutatorgarfi ranged valso according to Figure .2,-gand-jif0 .the two commutatore 'arek shifted ,A-.iiviitlifrefV v spect to one another, fit Willbefnoted th 'v l A any positionA other .i thanj the correct nei-only*l Y one segment i of any-r gre-upfwilh atch ylu'ipf nether-vr correct ,posi-tion. vnot ymorey than thre" .5,190v

` willbe transmitted over a circuit as follows:

vi221, 12b, 12, 12d 'and 12e.

ments of one group will match up with three segments of any other group, so that if the sunflower devices get out of step the messages will be hopelessly confused and no subscriber can read a message not intended for him. Figure 3 shows the normal arrangement of segments on the branch lines which is Athe same in all cases and is standard.

The electrical connections of one particular kind of apparatus for carrying out the metho'd will now be described. 1n Figure e X and Y represent two central stations connected by a main line 1 and X, repre sents a substation 'connected with central X by aline 2 and Y3 represents (another substation connectedv to central Y by a line 3. At each of the stations X3, X, Y and Y3 areisunflower devices 11,' 5, 6 vand 7, the trailers of which are driven Vby suitable syn chronizing devices 8, 9, 10 and 11, which keep all of theV trailers 'at the dierent stations on corresponding segments at the same time and might, for example, be similar to the devices shown in -my Patent No. 1,517,381,"granted.Dec 2, 1924. The segments of sunflower device i are connected consecutively toa series of movable contacts The contacts 12a to 12e` maybe operated in any suitable manner. F or example, they maybe operated as described in my Patent No.

"1,517,381, granted Dec. 2, 1924'. The contacts 12L to 12e, when moved forward, engage contacts 13a to'13e, all of which are connected together and to ground. Collecting ringV 14 is connected to line 2. As trailer brushes 15 are rotated, impulses positive pole of-generator 16, resistance 17, coil of main line relay 13, line 2, collecting ringV 14, trailer brushes 15, segment 19l to 19e, contacts 12 to 12e, contacts 13a to 13e, to ground and return to the negative pole of generator 16.

As trailer brushes 15 arerotated impulses will be transmitted over line 2 according to the signal to be sent and tongue 20 of relay 18 will oscillate between contacts 21 and A Vresistance is connected` between the positive and negative sources of current supply. The middle point 2e of resistance 23 is connected to one terminal of each of the 7 coils of a. series of relays 25a to 253, the other terminals of whichY connect to tive consecutive segments 26ato 26e according to the arrangement lshown in Figure 3. VContacts 21 and 22 are connected to points 27 and 23 on resistance 23 midway between its middle point and its positive and negative' terminals. As tongue 2O is operated by the signals transmitted over line 2 positive or negative y impulses will be transmitted through -each of the relays-Z5EL to 25e, as trailer brushes 29 rotate in synchronism with trailer brushes 15. Continuous direct current flows through resistance 23 and positive or negative impulses will be transmitted through a circuit from middle point 24 through the coils of one of the relays 25a to 25e, through a segment 26a to 26e, trailer brushes 29, collecting ring 30, tongue 20, contacts 21 or 22, to point 27 or 28 on resistance 23. After trailer brushes 29 have completed a revolution, the series of relays 25l to 25e 'will'have their tongues 31a to 31e set forward or backward in combination corresponding to the combination in which contacts 12a to 12e were set at the beginning of the revolution.

A series or' auxiliary relays 32a to 3f, one corresponding to each of the relays 25"L Ito 25e, have one terminal of their back coil connected to a contact 33a to 33e on a correspending relay 25a to 25e and one terminal of their forward coil connected to a forward contact 341 to 34e on a Vcorresponding relay 25a to 25e. rThe remaining coil terminals of relay 32L are connected together and connect to tongue 31b of the relay 25, and the rew maining terminals of relays 32h, 32C, 32d are connected in a similar manner and to tongues 31C, 311 and 31E respectively, and the remaining two terminals of relay 32e connect to gether and to a resistance 35 to the positive terminal. The tongue 31a of relay 25a is connected to segment 36. After all ofthe tongues 31rt Y to 31e have been set, trailer brushes 37 pass over segment and transmit an impulse over a circuit traced as follows: positive terminal, resistance 35, forward 'or back coil of relay 32e, forward or back contact of relay 25", according to the position of tongue 31e, forward or bach coil of relay 32d, forward or baci: contact of relay 25d, and so on through the remaining relays of the series to segment 36, trailer brushes V37, collecting ring 33, to the negative terminal. This impulse will simultaneously set all of the tongues a5 to 115 in combination corresponding to the setting of the tongues 31a to 31e.

All of the forward contacts 39a to 39e of relays 32a to 32e are connected together and through resistance et() to the negative pole of the generator' e1 and all of the bacli contacts e2 to 1:2@ of relays 32a to 32e are connected together and through resistance 13 to the positive pole of generator The tongues 115 to ilo" are connected to segments 46a to 116e in the arrangement as indicated in group C of 7iligure 2. As trailer brushes 47 rotate, a series of impulses corresponding to the impulses transmitted over line 2, but in asequence corresponding to group C Figure 2, will be sent over line 1. rllhe circuit may be traced as follows: negative pole ofy generator 4:1 or positive pole of generator Lleiresistance 40, or resist-ance 43, contacts 39" to 39e or contacts 12'to 42e, tongues 45a to 45e, segments 46a to 46e, trailer brushes 47,

f 1,558,280rk l *i .collecting ring 48, line 1,'coils of relay/49, vto ground and backtoxthe other'pole of. generator 41.01' y44. Byv these yimpulses'tlie 1' tongue 5.0 of relay 49fwill be' vibrated according to. the setting of the tongues 45a .to45e., 4

At central there isf a resistance 51, a

.relay 49,'a group Of eays 52a 5052 and anauxiliary groupof relays 53a to 53e, all

oflwhioh are operated in -a manner similar to the' corresponding parts, resistance 23,.,re.-

" Y lay 18,'relays 25a'to`25", andauxiliary relays 32a to-'32e, at central station X, the 'only dif- 'fference being that segmentedring 514 has I twenty segments instead of seven as in the case of vsegmented'ring `55 at station X, and fthe relays 52a to. 52e areoperated in.. a' se- .quence corresponding 'to group C of Figure 2 vinstead of the sequence as shown in Figure 3, as is the case with relays dV to 25e; u All of the forwardcontacts 562L to 56e of *i auxiliary relays 53n to 53 are-.connected i together and through'a resistance 57 .to the i'. positive pole of generatorf58. The tongues'` p' 59at0` 59eof relays 53a.v to-53e are connected separately .to live consecutive segments. 60a

.jjf' to 6()e according to the arrangement shown `in'rliigure `3. As trailer brushes 61 rotate,

viiinpulse'swill be transmittedover a circuit yas follows: positive polev of generator'S,

resistance' 57, forward contact 56at to 56e of the relays 53a to 53e, tongues 59a to59e,' segments 60a to 60,trailer brushes 61,'colle'cting ring y62,Y line collecting ringV 63,v trailer brushes 64, segments'EL Vto 65e, coils-of magfnets 66a toz66e, to ground and to the .other pole of generator 58. As .the trailer brushesl 61 and G4are rotating in synchronism,the l impulses controlled by veach of thel relays .153a to' 53e will be distributed at'sub'station Y, to corresponding ones of the magnets 66at f to 66e. The magnets 66a to 66e maybe the'v @combination magnets ofthe type printing recorder'vshown iii my Patent No.

What I claim is:v i 'A l. Ther combination in aftelegrapli system 4 of a number of stations, a line interconnecting two of said stations, a rotating distributor at one .of said stations, means ini cluding a plurality of relays arranged to cooperate with said distributor during a given 7 fatt revolution thereof for storingl a plurality of separate groupslof signal impulses, corresponding impulses in all groups beingstored in the same-definite order, a second plurality ofV relays, means rendered .effective by the y 'distributorat" thee'nd ofA said, given revolu- 'f tion` for. transferring said .fgroupsof impulses ,kfromthey firstto lthe Vsecond relays`,l'a1nd vmeans Vcooperating withsaid secondjrelays and with the distributor `during a subsequent revolution thereof fortransmitting Y said groups of stored impulses over the line in such mannerl that the impulses'of ea'ch'` n group are sent' in an orderdierent. fromv that of other groups.

tion thereof for storing a pluralityof separate groups of signal impulses, corresponding impulses in allgroups being stored in the vsaine definite order, a secondv plurality i of'relays, means rendered effective by the V distributor at the end of said-given'revolution for transferring said/groups ofr'im-Y pulses from'the first to the second relays,

means cooperating with said second* relays f 'Y yand with the distributor' `during a subsequent revolution thereof; for transmitting said Y '85. such manner that the .impulses of each groupY`4 l groups of stored impulses over the vline in are sentgin"an order dierent from that of Aother groups, aY rotating distributorfat the second station,ja groupof're'laysv cooperating with said lastldistributor during aV` given revolution thereofV to receive and store said lgroups of impulses in the order in which they vare sent over Ythe line,otlier relays, and means cooperating withsaid last distributor during a subsequent revolution: thereof for transferring from the first men-.

tioned relays of the secoiidstation"tosaidf* i last mentioned relays and for storingthere! on said-,groups of impulses in the same order Y l0() Y which Athey were originally stored? inthe In a'telegraph system,

first oice,means for sending a group of sige I a first anda 'A second-central office,amain ylinexintercongli" vnecting said ofiice's,-lines incoming :to saidv .1 Ynal, impulses over said incoming lines simultaneously, a rotatingr distributor Vat the first central office, .relays cooperating withA said distributor during one revolution thereof l vfor storing inthe same definite order the impulses of all ofv said. groups, a seriesof polarized relays, Va series circuit closed.` by

said distributor at the end of said revolution, y

for operating said polarized relays in one direction or the other according tothe operation of -said rst relays vto store on said said polarized .relays and said distributor for. sending over the main linefduringthe ynext revolution'of the distributor groups of y impulsesY in whichr the L several impulses of l each group occur .in -anforder diEe'rent from the'order of any othergroupandr different. y from the order yin'which anygroupwas stored upon said relays.' fv

Intestimony whereof -I affix y Louis Porrs.

.polarized relays s-aid groups of. impulses,j and means including [connections betweenVV 

